Walter Grant Notley (January 19, 1939 – October 19, 1984) was a provincial politician in Alberta, Canada. He served as a member of the Legislative Assembly of Alberta from 1971 to 1984 and also served as leader of the Alberta NDP from 1968 to 1984.

Notley ran for a seat to the Alberta Legislature for the first time in the 1963 as a candidate for the Alberta NDP. He was easily defeated finishing last in the four way race losing to incumbent Edgar Gerhart.[1]

In October 1984, Notley and five other passengers were killed in a plane crash among whose survivors was Larry Shaben. His death came shortly before the party's breakthrough in the 1986 provincial election in which the NDP won 16 seats with 29% of the vote.